Pneumatic tire and method of building the same



April zo 1926.. Lmzffm J. KEARNS ET AL' PNEUMATIC TIRE AND METHOD OF BUILDING THE SAME Filed Nov. 19, 1925 2 Sheets-Sheet l a "1 April 2@ ,1926. rL5M-,743 J. KEARNS ET Al.

PNEUMATIC TIRE AND METHOD OF BUILDING THE-SAME Filed Nov. 19, 1923 2 Sheets-Sheet 2 owiwno it vtii.. hier Juli Be it known that we, JOHN KEARNS and Exim GRAY Willemsen, citizens 'of the United filetes oil lliinerice, hot 1 residing et Consho hoeken, in the county oi ltiontgoinery enel. Stute ot iennsylvunin, have invented een t in new and nseiul improvements in lnennutrie rifiree and Methode oi' Building the Flaine, ot which the following is e, specilienn. @nr invention relates to new and useful improvements in pneun'ietic corcl tires. and n the niethodl et making the saine, and. has r :in object to Construct pneumatic cord e huilt up of e plurality of piies oit cord uric which are of such Width that the lies is' he oifietl hach over the beads or eacl ns to thereby flonhle the 'plies at the side alle of the casing and form e stili greater iniher of thicknesses centrally of the tirej ie number et thicknesses of material at the center 'tiepeniing upon Whether ali the edges the plies are mede to overlap, or Whether e ere inecle to ahnt and the remainder to i ln iehric es en iilnstretion, these may he two-perl); placed one upon the other, enti the 'pli being; of such- Wifltli that they maybe 'ioltleffl haelt over the heeel strips and the fee ci the -plies'eainseci to overlap cenelly ot the carcass, sind thus @euse sin inrers oi' material centrally enti peripherally oi the carcass, or some of the eflges oi the 'ifoirlefl over portion may just ahnt, enel in. 'his instance, iivc layers of corel materiel. would?. exist centrzinyoi the tire. v@Then tiro or more erige@ are cmisel to ahnt, however, e strip nseci to overlap one of the nhntti eclges, :incl to umlerlie the other, thus ,aclling another thickness of inateriei across the center of Athe carcass.

Still another object of the invention is to iogi'm e pnehrnotic tire of corti fabric, the width et thenyfpiiee being such that they may lic lloltletl back over the heini strips and censeri'to oveniop either on the outside of the careless? or on the inside of the carcass,

5:itili another ohjieet oi the invention is to or cle o tire which is formed by Stretching "plies on a pulley hond or drinn, the plies heine' et such Width thet aifter'the heeel strips plecetl in position. 'the several plies niey beviohlecl hnclr over the beati. and.

her words0 taking* two plies oi corel overlap centrally of the carcass, some ott the @tigres oit the plies which 'extend in one clirec'tion, ritengo/il to interlock with the. edges of the plies extending in the opposite direc-- tion.

ln o copcnfling applicationt iilccl hy ns on November 19, v3.323, hearing Serial No. 675,592, we here .shown o tire of this construction to ilhistrnte how 'the apparatus shown in that application may he used-to hnilfl :i tire oi this form, although this tire7 which forms the subject matter of the present application7 might be built on n different 'forni of rotatable drum.

Still another object oit the invention is to so construct a tire cerenss that it will have a greater number of plies of cord fabric centrally of the tire than along; the side Wells ot the tirei due to the feet that the 'plies are not only `loltied hach over each other, but the edges thereof, are censecl to overlap.

celtill another object ot the invention is to provide e tire and e method ot forming the sgml@ wherein the tire may he macieiin e very rapid manner, due to the tact that a. slcillecl operator can more quickly ohl over .and lap the several plies of eorcl fabric than he cenldepply ioiir or sin plies narrower in width to the piiliegfv henri or clruin.

Still another object of the invention is to' form e tire which will oe relatively' cheap to manufacture, relatively easyV to louild en. highly eiiieicnt in service With 'these enti other objects in View, the invention consists in certain ,new and novel features or". construction end combination of parte es will he hereinafter more fully clescrihed and pointed ont in, the' olonne Referring new to the tlrewings;

Fig. l ie' o cliegrammetic View Showing two plies oi cord fabric he'ore they ere folded around the head, the 'plies heilig;`

shown'extending in e ULsliape for the `Seite of clearnees;

Fig. 2 shows tjnese two plies lapped enel with a gum strip inserted between two out the plies and the carcass approaching; itstire shape;

lfig. 3 shows a ooinpletefi tire 0i the over iupperi. sections together with gum strip, breaker stock and the treed in position; each ot' the sections showing overlapping;

Fig. 1lie o sectional View of the overlapped plies ot corti fabric as they will op ieri lli

pear on a drum with a gum strip between two of the overlapped portions, the lapping edges appearing on the outside of the carcass;

Fig. 5 is a similar view inverted and with the overlappings inside the carcass;

Fig. 6 is a fragmentary top pian view showing how two ot the opposite edges of the foldedA over fabric may interlock, a gum strip being placed over the i'nterloclged portion, a portion of the outside ply being broken away for the sake of elearness:

Fig. 7 is a similar view. the interlocliiin,l sections being of slightly different contain..

ration; and..

Fig. 8 is a fragmentary perspective, show- A ing how the carcass will appear on the flat drum before the same is centrally and circumferentially expanded, two edges of the plies shown abutting.

Referring now to the drawing, and particularly to Fig. l, there are shown two plies of the ordinary cord fabric 1 and 2. these 'plies being disposed one upon the other so' 5 that the cords of the plies extend angularly toach other as is the well-known practice.

There are also shown the two chaling strips 3 and the-bead strips 4. l

In this figure, the plies are shown in a U-shaped configuration, this method of showing being for the purpose ot' clearness of description and illustration as to the way. the plies may be folded. In reality. the cord plies are laid tlat around a pulley band or circular drum (not shown) and will haye the appearance as illustrated in Fig. 4, or in the modified form, Fig. 5; and also as illustrated in the fragmentary perspective in Fig. 8. A form of drum on which these tires may be conveniently manufactured is shown in our co-pending application filed i November 19, 1923, bearing Serial No. 675,-

These two plies designated by the numerals 1 and 2 are of such width that they may be folded back over the bead'strips 4 as clearly shown in Figs. 4 and 8.

Referring nd'w more specifically to Fig. 4. it will be seen that the ply designated by the gure 1, when folded back over the head strip will form a ply designated by the numeral 5, and ply 2, when also folded, will form a ply as designated by the numeral 6. The left edge 7 of the portion of the ply designated by the numeral 5. it Will be no! ticed, does not overlap the other edge 8 of the portion of the ply designated by the nu .meral 5, but stops a short distance from it so that a gum splice strip 9 may be interposed between the two said edges 7 and 8. overlapping the one and underlying the other. This gum strip may or may not be used, and the edges 7 and 8 may overlap. rather than abut il desired. or the gum strip may he inserted over these edges if they overlap as well as interposed between them. As a rule a gum strip will be used in 'either instance.

In Fig. 2, the carcass is shown before it has been drawn in to tire shape to illustrati? the disposition of the circumferential edgfs of the several plies and their central meer ing point relative of the width of the carcass In Fig. 3, there'is'shown the tire casing as it will appear when completed: rin this instance, the tread stock 10 having been added, the breaker strip 11 and the cushion stoet; 12,.and it. will also be. noticed in this/view, that the several edgesof the plies overlap each other with aA gum strip between some ot the overlapping edges, rather than having two of the edges abut and a gum strip overlapping one edge and underlying the other.

0f course, the necessary flipper strips will be used and other little gum bands which are generally used in the making up of a pneu* ,matic tire.

.The component parts of the carcass will all be stretched upon the drum and several of the parts rolled and calendered, after which it will be stretched centrally and circumferentially to the desired sha-pe, which' operation may be performed as shown in the previous application referred to by us and hearing Serial No. 675,592. After the tirer has been so shaped and stretched, it may be subjected to the ordinary vulcaniz- ,and it is to be noticed thatthe carcass is inverted so that the laps. or overlapping portion of the carcass, will be on the inl side. rather than the outside of the carcass.

In Figs. 6 and 7. a slight change is made in the arrangement of the plies ot the carcass. in so far as the edges 16 and 17 of one ofthe two' plies shown, are cut to intermesh along the circumferential line 18, while a .um strip 19 may be placed over these edges.

he strip 19 takes die place of the gum strip 9. which in 'the other form shown, fits in between the overlapping edges or between the abutting edges. In Fig. 7. these intermeshing portions are substantially square shape as at 20. a gum strip 21 extending over them and the outer ply 22 extending over this last mentioned -gum strip.

In these last mentioned forms. the'ad- 4iacent edges not only abut. but interlock, thereby adding strength and rigidity to the whole carcass.

From the foregoing. it will be seen that by cutting the fabric bands of sucient A plied, may

memes tread stock, chang strips and flipper strips may beapplied to make up the completed carcass.

Although we have shown but two plies of cord fabric which are designed to be :folded back and lapped, itis to be understood that any number of plies may be used' in the same manner. A tire'formed in this Way is relatively strong, presents the greatest number ci thicknesses of material at the desired points about .the tiro` and is one which can be made in a lrelatively short space of time and thereby lessen the cost of production.

Although l have specified a cord fabric, it is understood that this is thepreferable fabric, but I do not wish to be limited to a cord fabric as it may be constructed of square woven' fabric on an iron core.

" Many slight changes might be made without in any Way departing from the spirit and scope of the invention.

Having thus described the same, what we claim as new and desirev to secure byLetters Patent is il.t A. pneumatic tirey comprising in part y several plies of fabric, bead strips, said plies folded back over said bead 'periphery of the tire.

strips andl some of. the plies having overlapping edges and other of the-plies having abutting edges lili circumferentially and centrally of the tire, and a gum strip interposed between the Y abutting edges and 'underlying the overlap ping edges 'for sealing the several edges.

2. A pneumatic tire comprising several"- said bands bef' suilicient 'Width toy be Y,folded back bands of fabric, bead strips, ing of. over said bead strips and s'onelof the edges overlapping and other of the edges nearly abutting, and a gum strip positioned under. one abutting edge and extending over an opposite abutting edge and underlying the overlapping edges of, the fabric 4for sealing the several edges a cushion and a tread" stock centrally of the casing and said gum strip also extending centrally and about the 3. The method of forming a pneumatic cord tire which consists in stretching several pliespt cord fabric on a drum, applying' the bead strips, the Width of 'the 'plies being such thatftheymay be folded over said bead strips and some .of the edges overlap cir-I cumferentially and centrally of said` tire and some of the edges substantially abutting, appiying a gum strip between two'of theoverlapping edges and over and under the said abutting edges for sealing the same,

applying the cushion stock and tread, er@

pan-ding the carcass circumferentially and centrally `to tire shape and vulcanizing the` same.

In testimony whereof we ax our signstures.

JOHN nnuaire. sans naar Wennen 

